The configuration method of DNS cache server with DNSMASQ under Linux _linux

Currently the latest version is 2.7.1, can go to its FTP download: http://www.thekelleys.org.uk/dnsmasq/

The installation process is relatively simple

Yum-y Install dnsmasq* 
wget http://www.keepalived.org/software/keepalived-1.2.9.tar.gz
tar zxvf keepalived-1.2.9.tar.gz
cd keepalived-1.2.9
./configure--prefix=/usr/local/keepalived make
& & make install
mkdir/etc/keepalived
cp/usr/local/keepalived/etc/keepalived/keepalived.conf/etc/ keepalived/
ln-s/usr/local/keepalived/etc/sysconfig/keepalived/etc/sysconfig/
ln-s/usr/local/ keepalived/etc/rc.d/init.d/keepalived/etc/init.d/
ln-s/usr/local/keepalived/sbin/keepalived/usr/sbin/
chkconfig--add keepalived
chkconfig--level-keepalived on

Keepalived configuration is very simple, only need to configure a VIP can float between the two servers can be achieved by the main standby

! Configuration File for keepalived
 
global_defs {
  notification_email {
   xxx@xxx.com
  }
  notification _email_from xxx@xxx.com
  smtp_server 127.0.0.1 smtp_connect_timeout router_id
}
 
Vrrp_instance DnsCache {
  state MASTER         //Another configuration backup
  interface eth1        //Server status detection
  on which interface virtual_router_id
  Priority 180         //backup machine is configured with the
  advert_int 1/         check interval, in seconds
  Authentication {
    Auth_type pass
    auth_pass 1234
  }
 
  virtual_ipaddress {       //VIP settings, designated to intranet NIC 
    192.168.100.99/24 dev eth1
  }
}

DNSMASQ's configuration is simple, too.

resolv-file=/etc/resolv.dnsmasq.conf
cache-size=1000
conf-dir=/etc/dnsmasq.d

Write DNS address to/etc/resolv.dnsmasq.conf file

echo "NameServer 8.8.8.8" >/etc/resolv.dnsmasq.conf

Native and LAN all other server DNS resolution uses it

echo "NameServer 192.168.100.99" >/etc/resolv.conf

Finally find a LAN server verification, if you can explain the normal.

Nslookup www.google.cn 192.168.100.99

This scheme is only suitable for small enterprises, in the case of small-scale use, when the resolution is large or with the best bind.

The following are additional users:

Copy Code code as follows:

sudo pacman-s--needed dnsmasq
Cd/etc

[Admin@huangye etc]$ sudo cp-v dnsmasq.conf{,.orig}
' dnsmasq.conf '-> ' Dnsmasq.conf.orig '

[Admin@huangye etc]$ sudo vim dnsmasq.conf

In contrast, the DNSMASQ configuration is much simpler:

Copy Code code as follows:

Resolv-file=/etc/dnsmasq.resolv.conf
Addn-hosts=/etc/dnsmasq.hosts
local=/localnet/
No-dhcp-interface=eth0
Conf-dir=/etc/dnsmasq.d

Copy Code code as follows:

[Admin@huangye etc]$ sudo cp-v resolv.conf dnsmasq.resolv.conf
Password:
' resolv.conf '-> ' dnsmasq.resolv.conf '
sudo mkdir/etc/dnsmasq.d
sudo touch/etc/dnsmasq.hosts

SUDO/ETC/RC.D/DNSMASQ start

Finally, don't forget to join Rc.conf Daemons, and pay attention to the network behind.

DNSMASQ can read entries from an additional Hosts file, such as adding forward resolution:

echo "IP address domain name" >/etc/dnsmasq.hosts

In addition, restart DNSMASQ can be used Sighup (you can modify the Hosts file, let the configuration take effect)

Killall-s Sighup DNSMASQ

To view service status:

Netstat-tunl
TCP 0 0 0.0.0.0:53 0.0.0.0:* LISTEN
UDP 0 0 0.0.0.0:53 0.0.0.0:*

Again dig, found stable at 4ms, I halo, the same configuration, I am in an Ubuntu server 10.04 above dig is 1ms, in my native incredibly in 4ms, embarrassed